kas: split into unique files and add testimage

Refactor the existing kas configuration by splitting it into a shared
base.yml and a set of per-machine include files. This allows for easier
usage and potential CI use cases.

Also, change the readme to reflect the new changes.

Signed-off-by: Jon Mason <jon.mason@arm.com>

kas/base.yml

@@ -0,0 +1,79 @@
+# yaml-language-server: $schema=https://raw.githubusercontent.com/siemens/kas/master/kas/schema-kas.json
+#
+header:
+  version: 14
+
+machine: unset
+distro: poky
+target:
+  - core-image-base
+
+defaults:
+  repos:
+    branch: master
+
+repos:
+  meta-raspberry:
+
+  bitbake:
+    url: https://git.openembedded.org/bitbake
+    path: layers/bitbake
+    layers:
+      bitbake: disabled
+
+  openembedded-core:
+    url: https://git.openembedded.org/openembedded-core
+    path: layers/openembedded-core
+    layers:
+      meta:
+
+  meta-yocto:
+    url: https://git.yoctoproject.org/meta-yocto
+    path: layers/meta-yocto
+    layers:
+      meta-poky:
+
+  meta-openembedded:
+    url: http://git.openembedded.org/meta-openembedded
+    path: layers/meta-openembedded
+    layers:
+      meta-oe:
+      meta-python:
+      meta-networking:
+      meta-perl:
+
+  meta-qt5:
+    url: https://github.com/meta-qt5/meta-qt5/
+    path: layers/meta-qt5
+
+env:
+  BB_LOGCONFIG: ""
+  BB_HASHSERVE: "auto"
+
+bblayers_conf_header:
+  standard: |
+    POKY_BBLAYERS_CONF_VERSION = "2"
+    BBPATH = "${TOPDIR}"
+    BBFILES ?= ""
+
+local_conf_header:
+  reduce_diskspace: |
+    INHERIT += "rm_work"
+  standard: |
+    CONF_VERSION = "2"
+    PACKAGE_CLASSES = "package_rpm"
+    SDKMACHINE = "x86_64"
+    USER_CLASSES = "buildstats"
+    PATCHRESOLVE = "noop"
+  debug-tweaks: |
+    IMAGE_FEATURES += "empty-root-password allow-empty-password allow-root-login post-install-logging"
+  diskmon: |
+    BB_DISKMON_DIRS = "\
+        STOPTASKS,${TMPDIR},1G,100K \
+        STOPTASKS,${DL_DIR},1G,100K \
+        STOPTASKS,${SSTATE_DIR},1G,100K \
+        STOPTASKS,/tmp,100M,100K \
+        HALT,${TMPDIR},100M,1K \
+        HALT,${DL_DIR},100M,1K \
+        HALT,${SSTATE_DIR},100M,1K \
+        HALT,/tmp,10M,1K"